An annoying or judgmental, hippie, tree hugger, vegetarian, or vegan. Anyone that gives you a dirty look because you eat meat, wear leather, don’t use hemp products and especially if you didn’t volunteer or contribute to cleaning up animal victims of oil spills (i.e. otters). More work appropriate than saying ‘dirty hippie’.
Note: Actual Otter Scrubbing is totally commendable.

“I hate eating my egg salad sandwich in front of David because he gives me an evil vegan stare down, what an otter scrubber!”